What device is used to regulate draft or airflow in air handling systems?

The device used to regulate draft or airflow in air handling systems is a damper. Dampers can be found in both supply and return air ducts and they play a critical role in controlling the volume of air that flows through a system, ensuring that air is distributed efficiently and effectively throughout a space. By adjusting the damper, an operator can reduce or increase airflow as needed, which helps maintain desired temperature and air quality conditions.

Dampers come in various types, such as manual or automatic, and can be used in conjunction with sensors and control systems for more precise airflow management. The ability to finely tune airflow is essential in heating, ventilation, and air conditioning (HVAC) systems for comfort and energy efficiency.

In contrast, while terms like vane, shutter, and vent may relate to airflow in some contexts, they do not specifically denote the functionality of regulating and controlling airflow within air handling systems as effectively as a damper does. A vane typically refers to a device that directs airflow but is not primarily used for regulation. A shutter and vent can control openings but lack the fine control aspect that dampers provide. Therefore, the damper is the most appropriate answer for airflow regulation in air handling systems.